The late Alan Rickman was perhaps most thought of for his villainous roles, but he technically only played two, and Snape, as it turns out, technically wasn’t one of them. (The others were in “Die Hard” and “Robin Hood: Prince of Thieves,” of course.) You could even watch him play very nice — as a ghost, as it were — in 1991’s “Truly, Madly, Deeply,” were it legally available to stream anywhere. (You can, wink wink, find it on YouTube.)
Or you could watch him play hilariously prickly in the sci-fi comedy “Galaxy Quest,” as a fine British thespian mostly known for an old role in a “Star Trek”-like sci-fi show, and particularly for his character’s overwrought catchphrase (which begins, “By Grabthar’s hammer…”). No doubt Rickman suffered through “Galaxy Quest” nerds pestering him with that line, but given how delightful the film is — which finds he and his old castmates aboard an actual space ship, doing battle with actual evil aliens — it might have been worth it.