The 85-year-old Mubarak was wheeled into the defendants' cage in a heavily-fortified courtroom in Cairo on Saturday, sitting upright, confident and waving to supporters.
It's his second court appearance since he was released from prison in August and transferred to a military hospital, where he is being detained pending trial on corruption charges.
Mubarak was convicted and sentenced to life in prison for failing to stop the 2011 killings, but his sentence was overturned on appeal earlier this year and a retrial was ordered.
Mubarak's two sons and a former security chief are also in court with him.
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