Michael Lewis — the man accused of stalking Caitlin Clark — appeared in court on Tuesday and immediately made waves … exclaiming he was “guilty as charged” before the proceedings even got started.

The bizarre scene all unfolded inside of an Indiana courtroom … just two days after Lewis was arrested in Indianapolis on allegations he sent harassing and disturbing messages to Clark throughout December and January.

The 55-year-old Texas native — wearing an orange jumpsuit and handcuffs — was escorted into the courtroom by authorities … and as he sat down — he said out loud he was “guilty as charged.”

The judge then informed him his statement was not necessary … adding, “You have a right to remain silent, and I expect you to exercise that, OK? This is just telling you what the charges are.”

Lewis, however, continued with his unusual behavior … urging the judge to “throw me the booky.” Several minutes later, he complained about his medication.

Eventually, Lewis was assigned a public defender … and his official plea was entered as “not guilty.”

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As he left the courtroom, the judge again advised Lewis to “remain silent in the jail and only talk to your attorney.”

Lewis — who’s facing a felony charge of stalking that carries a maximum sentence of up to six years behind bars — signed docs ordering him to stay away from Clark … and his bail was set at $50,000.

He’s now expected to appear before a judge next in March.