In Rescue from Midnight Castle, danger is Firefly's life! Also, Felix Unger has a little piece of rainbow.
Tirek is the narrator of The Transformers.note He was also a TV announcer that has done numerous commercials, including Transformers commercials, and various two minute infomercials, usually as the closing announcer, and usually not with his "Transformers narrator" voice.
Missing Episode: There was actually another TV Special in the works between Midnight Castle and Escape from Catrina, which would have focused on the Rainbow Haired ponies. Alas, only one trailer for it was ever released, and the special has otherwise never seen the light of day.
It is believed Danny was supposed to be in it as a Swedish cover for the Catrina special vaguely resembles the trailer and has him on it instead of Megan.