Highlander star Christopher Lambert gave fans a frightening scare Saturday after collapsing during a packed fan convention and being rushed to the hospital by ambulance.

The 69-year-old French-American actor, who also famously played Tarzan, was signing autographs at Steel City Con in Pittsburgh, Pennsylvania, when he suddenly suffered a medical emergency and went down, according to TMZ.

The alarming incident unfolded in front of conventiongoers as Lambert was meeting fans and signing memorabilia.

An ambulance was called, and the veteran actor was taken to a nearby hospital for evaluation.

Fortunately, the situation appears to have ended on a much more reassuring note.

Lambert’s team later said the actor was “totally OK” and had returned to his hotel room, where he was resting after the ordeal.

A spokesperson said the collapse was apparently caused by low blood sugar after Lambert had eaten very little since arriving in Pittsburgh. A lack of sleep the night before may have also contributed to the scary episode.

Despite the positive update, it was not immediately clear whether Lambert would feel well enough to return to Steel City Con for Sunday’s scheduled events.

The medical scare quickly drew attention because Lambert remains a beloved figure among fans of 1980s action and fantasy films.

He became an international star playing immortal Scottish warrior Connor MacLeod in the 1986 cult classic Highlander.

The movie spawned multiple sequels and a television franchise, cementing Lambert’s place in pop-culture history.

Two years earlier, Lambert took on another legendary role when he starred as Tarzan in 1984’s Greystoke: The Legend of Tarzan, Lord of the Apes.

The brooding actor went on to build a decades-long career in film as an actor, producer and writer.

For fans who witnessed Saturday’s frightening collapse, however, the biggest relief was hearing that Lambert was back at his hotel and recovering after the unexpected hospital trip.