"Different Dimension", usually abbreviated "D.D.", and called 異次元 (Ijigen) or Ｄ．Ｄ． (Dī Dī) in the Japanese version, is a series of cards that focus on banishing cards, often including themselves once they are defeated, thus sending them to a 'different dimension' as opposed to just destroying the enemy. Although they were released in different sets, a large amount of "Different Dimension" monsters were released in The Dark Emperor Structure Deck. Nelson Andrews used some D.D. cards in the ZEXAL anime. This series is related to the "Galaxy" and "Sparrow Family" archetype/series.
These cards are not without their weakness however. "Imperial Iron Wall" will effectively shut down nearly all "D.D." cards (with the exception of a small few like "Different Dimension Dragon".) Because "D.D." is often associated with the "Sparrow Family" the "D.D.'s" strongest monsters overall are "D.D. Esper Star Sparrow" with 3000 ATK, and their strongest monster is "D.D. Jet Iron", with 4000 ATK. However, these two cards are much more affiliated with the "Sparrow Family" than "D.D." and do not share the "D.D.'s" usual banishing strategies. Beyond them, however, "Different Dimension" monsters are rather weak in terms of offense, with no other monsters in their family having ATK higher than 1800. Furthermore, while there are "Different Dimension" Spell and Trap cards, the series lacks any "D.D."-specific support. This lack thereof, combined with a low average ATK, make it difficult to create a Deck with only "D.D." cards, which means that "D.D." cards are more commonly used as a sub-type (mostly in "Banish" Decks).
However difficult, it is possible to have a sound "D.D." primary Deck, for cards such as "Homunculus", "Eiza" and the "Helios", gain attack and defense points multiplied by a certain number to your/both your and your opponent's banished cards. In a "D.D" Deck that focuses only on banish cards, these monsters can become a massive threat to your opponent, continually gaining in power. Also, the effects of "Imperial Iron Wall" can be remedied by running Spell/Trap Cards that destroy other Spell and Trap Cards, such as "Mystical Space Typhoon", "Dust Tornado", etc. In addition, "Monarch" monsters can also facilitate this process, and, if the proper card is present; ie, "Dimensional Fissure", and "Macro Cosmos", also banish them, and possibly damaging your opponent in the process with cards such as, "Thestalos the Firestorm Monarch", "Caius the Shadow Monarch", and the worth mentioning (however not a "Monarch", "Super Conductor Tyranno", with which you can keep recycling "Survivor" and/or "Scout Plane" to damage your opponent each turn.
Macro Monarch Deck
"Macro Monarch" Decks uses "D.D. Survivor" and "D.D. Scout Plane" as Tributes for the summon of Monarchs and other Level 5 and higher monsters with effects activated when summoned.