Late night did not stay dark long.

Days after announcing that his show would be off the air for several weeks, the host of CBS’s “The Late Show With Stephen Colbert” made a surprise appearance on Monday, delivering a 10-minute monologue from his bathtub.

“Welcome to my bathroom. I’m your host, Stephen Colbert,” he said at 11:35 p.m. “You’re watching a very special social distancing edition of ‘The Late Show.’”

Surrounded by bubbles, Mr. Colbert was dressed in a dark suit, sporting facial scruff and wearing AirPods. A toilet was visible in the background.

Like his fellow late night hosts — a group that includes NBC’s Jimmy Fallon, TBS’s Samantha Bee, HBO’s John Oliver and Comedy Central’s Trevor Noah — Mr. Colbert said last week that his show would suspend production until at least March 30 to guard against the spread of the coronavirus.